Stencil sheet



Patented Nov. 2,- 1 937 UNITED STATES auas m srancm snan'r Shlnjiro Horii, Tokyo, Japan No Drawing. Application May a, 1938.

Serial No. 82,090

-1 Claim. (CL 41-48.)

This invention relates to stencil sheets'for use in duplicating manuscript or typewritten matters and the like, consisting of a sheet of fibrous material provided with a coating of an ink-resisting composition, and which can be stencilized by the pressure of a stylus,,or the type of a typewritingmachine. Y

Heretofore the stencil sheets of this kind have been made generally of a base sheet of fibrous paper coated with a coating material comprising a protein substance, suclf as glue or gelatine, or a cellulose compound, such as cellulose nitrate, both being incombination with some suitable softening materials. The effective softening materials are usually vegetable oils, fats and fatty acids.

-According to the present invention the stencil sheets are prepared by the fibrous sheets, such as Japanese Yoshino paper, being coated with a composition including a gelatinous organic col- I loid, such as gelatine, in admixture with mono-' or dl-oleic acid ester of glycerin, an emulsifying agent, such as Turkey-red oil, and pigments.

With regard to stencil sheets of this character it may be also stated that thecoating composition thereof comprises gelatine together with softening materials, such as (1) naphtheni'cacid .esters, e. g. ethyl naphthen'ate, a glycol naphthenate and glyceryl naphthenate, and (2) a higher hydroxy-fatty acid ester of a di-hydric alcohol such as a ricinoleic acid ester of a glycol. The monoordi-oleic acid ester ofyglycerip is an oily material which is more easily emulsifiable with'gelatine solution than the natural oils or fats. It is miscible with mineral oils. It is neither sticky nor'tacky and without the defect of becoming rancid, on keeping. Consequently the stencil sheets produced in accordance with the present invention possess certain advantages over, the sheetsproduced by the use of triglycerol defect of becoming sticky on keeping, and are capable of being more easily and sharply stenciliaedby onlyalightpressure.

The following-is an example:-;--

' I Parts by weight Gelatine 1Q Oleic acid mono-glyceride 25 2o Glycol -oleate Oleic a 10 Heavy mineral oil 10 Turkeyqed oil 25 Ultramarine bl Kaolin a 10 Powdered agalmatolite' 10 "Water 200 Hexamethylentetramine 1 Preservative 1 In the carrying out of the invention, a gelatine is swelled by being soaked in water, whereupon it is dissolved'in hot water. The solution is then mixed and emulsified with Turkey-red oil, monoordi-oleic acid ester of glycerine and other suitable 5 softening agents, such as monoor di-oleic acid ester of ethylene glycol, ethyl oleate, naphthenic' acid glycerides, oleic acid, and mineral oils, in admixture with some suitable'pigments, such as ian blue, ultramarine blue, organicglakes, 10 kaolin, powdered talc or agalmatolite, barytes, blanc flxe. The mixture. is then applied to a base sheet, such as Japanese Yoshino paper, in the usual manner. a The proportions of the ingredients of the com- 15 position may vary according to circumstances.

A hardening agent,,such as formalin or hexamethylentetramine, and a preserving agent, suchas phenols ortheir derivatives. may be added to the coating mixture. j

What I claim is:-.

A stencil sheet, comprising a base of fibrous material material coated with a composition including-gelatine, monoor di-oleic acid ester of glycerine, monoor di-oleic acid ester of ethylene glycol, oleic acid, Turkey-red oil, a heavy 40 mineral oil, Prussian blue, organic lakes, kaolin, powdered agalmatolite, hexamethylentetramine,

and a preservative. m l.

- SHINJIRO EORIL 

